Breast cancer survivor Linda Venus believes there should be more stringent oversight of thermography. (CBC )The Winnipeg woman calls the current situation "a vacuum in the regulatory structure of the health system that is supposed to protect us from scoundrels."

The website of Health Scan Digital Thermography Clinic in Ontario says the test is the "earliest method of possible breast cancer detection known."

A federal spokeswoman says Health Canada takes action if an equipment manufacturer makes misleading claims, but she says it's up to the provinces to take action against the clinics if their advertising is misleading.

But a CBC News investigation found no evidence that Health Canada has gone after any manufacturers producing devices related to thermography,

In the U.S., the Food and Drug Administration has sent warning letters to those making unproven claims about thermography.

Should Health Canada crack down on manufacturers of thermography equipment? Should the provinces do the same for clinics making misleading claims? Let us know what you think.